Display screen or portion thereof with transitional graphical user interface



FIG. 1 is the first image in a sequence for a display screen or portionthereof with transitional graphical user interface showing my newdesign;

FIG. 2 is the second image thereof;

FIG. 3 is the third image thereof;

FIG. 4 is the fourth image thereof;

FIG. 5 is the fifth image thereof;

FIG. 6 is the sixth image thereof;

FIG. 7 is the seventh image thereof;

FIG. 8 is the eighth image thereof;

FIG. 9 is the ninth image thereof;

FIG. 10 is the tenth image thereof; and,

FIG. 11 is the eleventh image thereof.

The outer perimeter broken lines in the drawings represent a displayscreen or portion thereof and form no part of the claimed design. Theremaining broken lines in the drawings illustrate portions of thetransitional graphical user interface that form no part of the claimeddesign.

The appearance of the transitional image sequentially transitionsbetween the images shown in FIGS. 1 through 11. The process or period inwhich one image transitions to another image forms no part of theclaimed design.

CLAIM I claim the ornamental design for a display screen or portionthereof with transitional graphical user interface, as shown anddescribed.